Manafort is reportedly blocking the FBI from reviewing his interview with Congress about the Trump Tower meeting

Attorneys for President Donald Trump's campaign chairman, Paul Manafort, are reportedly blocking Robert Mueller, the special counsel leading the FBI's Russia investigation, from obtaining a transcript of his interview with the Senate Intelligence Committee in July.

CNN reported on Tuesday that a dispute had erupted between the FBI, which said it had obtained authorization from Manafort's attorneys to view the transcript, and the committee, which says it was instructed by the attorneys not to hand it over.

Mueller's team has apparently gotten permission to view the documents Manafort submitted to the committee about the meeting he attended last June at Trump Tower with two Russian lobbyists and Donald Trump Jr., the president's eldest son. Trump's son-in-law, Jared Kushner, was also present.

Republican presidential nominee Donald Trump gives a thumbs up as his campaign manager Paul Manafort (C) and daughter Ivanka (R) look on during Trump's walk through at the Republican National Convention in Cleveland, U.S., July 21, 2016. REUTERS/Rick Wilking

Republican U.S. presidential candidate Donald Trump's campaign manager Paul Manafort talks to the media from the Trump family box on the floor of the Republican National Convention in Cleveland, Ohio, U.S. July 18, 2016. REUTERS/Jonathan Ernst

Paul Manafort, senior advisor to Republican U.S. presidential candidate Donald Trump, smiles as he talks with other Trump campaign staff after Trump spoke to supporters following the results of the Indiana state primary, at Trump Tower in Manhattan, New York, U.S., May 3, 2016. REUTERS/Lucas Jackson

UNITED STATES - JULY 20: A man with a security credential takes a selfie at the podium as Donald Trump, flanked by campaign manager Paul Manafort and daughter Ivanka, checks the podium early Thursday afternoon in preparation for accepting the GOP nomination to be President at the 2016 Republican National Convention in Cleveland, Ohio on Wednesday July 20, 2016. (Photo By Bill Clark/CQ Roll Call)

UNITED STATES - JULY 19: Paul Manafort, advisor to Donald Trump, is seen on the floor of the Quicken Loans Arena at the Republican National Convention in Cleveland, Ohio, July 19, 2016. (Photo By Tom Williams/CQ Roll Call)

NA.R.DoleMicCk1.081596.RG.Republican presidential candidate Bob Dole looks up from podium at balloons and television cameras as convention center manager Paul Manafort, at right, points out preparations for tonight's acceptance speech in San Diego, 08/15/96. (Photo by Robert Gauthier/Los Angeles Times via Getty Images)

But the committee hasn't turned over those documents yet, either, according to CNN.

Manafort's spokesman did not respond to phone calls seeking comment. But his attorneys' reluctance to allow Mueller to view the transcript is likely to raise red flags for the FBI and prompt it to take more aggressive measures to obtain it.

Manafort has emerged as a focal point of the FBI probe, which recently recruited New York Attorney General Eric Schneiderman to help investigate the longtime political operative for possible financial crimes and money laundering. The IRS's Criminal Investigations unit has been brought on to the investigation to examine similar issues, according to the Daily Beast, though it is unclear to what extent their work will focus on Manafort.

Mueller's team obtained a search warrant to raid Manafort's home in July. Sources told CNN that documents protected by attorney-client privilege may have been taken, but federal prosecutor-turned defense attorney Renato Mariotti said on Twitter that "incriminating" evidence "in plain view" and spotted by FBI agents during a raid is fair game.

RELATED: Trump-Russia timeline

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Putting the Trump-Russia timeline into perspective

June 7: The 2016 primary season essentially concludes, with both Donald Trump and Hillary Clinton as the presumptive party nominees

July 18: Washington Post reports, on the first day of the GOP convention, that the Trump campaign changed the Republican platform to ensure that it didn't call for giving weapons to Ukraine to fight Russian and rebel forces

July 22: WikiLeaks releases stolen emails from the Democratic National Committee

July 25: Democratic convention begins

July 27: In final news conference of his 2016 campaign, Trump asks Russia: "If you're listening, I hope you're able to find the 30,000 emails that are missing"

August 4: Obama CIA Director John Brennan confronts his Russian counterpart about Russia's interference. "[I] told him if you go down this road, it's going to have serious consequences, not only for the bilateral relationship, but for our ability to work with Russia on any issue, because it is an assault on our democracy," Brennan said on "Meet the Press" yesterday.

October 4: WikiLeaks' Julian Assange says his organization will publish emails related to the 2016 campaign

October 7: Department of Homeland Security and the Director of National Intelligence release a statement directly saying that Russia is interfering in the 2016 election

October 31: "This WikiLeaks is like a treasure trove," Trump says on the campaign trail

November 4: "Boy, I love reading those WikiLeaks," Trump says from Ohio.

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Obtaining a warrant after the fact to put documents into evidence that were not covered under the scope of the initial warrant is also common practice, Mariotti said.

Manafort's presence at the Trump Tower meeting came under intense scrutiny last week when NBC reported that he had been taking notes on his iPhone that referenced political contributions and the Republican National Committee.

Congressional investigators examining Russia's interference in the 2016 presidential election are now using Manafort's notes as a jumping off point to examine whether the Trump campaign or the RNC received donations from Russian sources after the meeting, according to NBC.

Democratic Rep. Eric Swalwell, a member of the House Intelligence Committee, told Business Insider on Tuesday that the committee "must" interview Manafort.

"Manafort is a critical witness," Swalwell said. "He was chairman at a time direct communications occurred between the Trump campaign and Russia."

Swalwell told Business Insider in an interview last week that "a complete investigation will answer whether the Russians were working with the Trump campaign and whether that included financial assistance."

"There are enough accounts out there that we should probe further to see if that was the case," he added, pointing to the meeting and the recent revelations about the Trump Organizationpursuing a real-estate deal in Moscowduring the election.